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FLAME SCANNER VIEWING HEAD FOR FLAME MONITORS, P/N: Model S511
FLAME SCANNER VIEWING HEAD FOR FLAME MONITORS, P/N: Model S511


 

Description
 
The S511 viewing head employs a Ge (germanium) photo detector which responds to a spectral range of 750-1900nm (nanometers). It will detect all types of flames including natural gas and propane.

The S511 is a bonafide infrared flame detector that detects all flame and is particularly useful for application where the combustion process might be considered inconsistent or unstable such as those found in the process industries. For example, the S511 works well on lime kilns because the AGC creates a more uniform flame signal throughout the different combustion stages. It also works well on sour gas (sulfur recovery) application principally because of the AGC action.

The signal from the detector is a flicker signal. All flames pulsate creating a flicker component which is what the S511 detects. The flicker frequencies emitted from flames range 0-2000Hz. The S511 responds to only the higher frequencies while rejecting the lower frequencies which are part of the general furnace or background flames.

The Ge element is a photodiode that is operated in the photovoltaic mode. (The diode generates current when exposed to light or radiation). The sensitivity range of this element is quite large so some means to prevent saturation in the first stage of amplification is required. (The PbS element has a rather limited dynamic range exhibiting not more than 15:1 ratio from dark to a bright signal). In order to prevent saturation an AGC (automatic gain control) circuit is used so that the DC component or "brightness" signal doesn't saturate causing a loss of the AC component or flicker signal.

The S511 employs electronics self-checking which is implemented by using an electronic switch that disconnects the photo detectors every second for 200 milliseconds. The resulting chopped signal is fed to the signal processor which monitors the signal in a fail-safe manner.

Please call or email for pricing and availability at 281-421-1321 or sales@pco2.com.



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